{"id":17757,"date":"2016-01-05T23:15:46","date_gmt":"2016-01-05T14:15:46","guid":{"rendered":"https:\/\/cg-method.com\/after-effects\/?p=17757"},"modified":"2026-09-20T12:53:47","modified_gmt":"2026-09-20T03:53:47","slug":"after-effects-gravity-expression","status":"publish","type":"post","link":"https:\/\/cg-method.com\/after-effects\/after-effects-gravity-expression\/","title":{"rendered":"After Effects\u2502\u30a8\u30af\u30b9\u30d7\u30ec\u30c3\u30b7\u30e7\u30f3\u3092\u4f7f\u3063\u3066\u91cd\u529b\u3092\u8868\u73fe\u3059\u308b\u65b9\u6cd5"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">After Effects\u3067\u91cd\u529b\u306b\u3088\u308b\u843d\u4e0b\u904b\u52d5\u3092\u8868\u73fe\u3059\u308b\u65b9\u6cd5\u3092\u307e\u3068\u3081\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u30ad\u30fc\u30d5\u30ec\u30fc\u30e0\u3092\u624b\u4f5c\u696d\u3067\u6253\u3064\u4ee3\u308f\u308a\u306b\u30a8\u30af\u30b9\u30d7\u30ec\u30c3\u30b7\u30e7\u30f3\u3092\u6d3b\u7528\u3059\u308b\u3068\u3001\u52b9\u7387\u3088\u304f\u81ea\u7136\u306a\u843d\u4e0b\u3092\u518d\u73fe\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u91cd\u529b\u306e\u30a8\u30af\u30b9\u30d7\u30ec\u30c3\u30b7\u30e7\u30f3<\/h2>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-plain\"><code>seedRandom(index,true)\nmGravBase=9.81; \/\/basic gravity\nmGravVar=random(-1,1); \/\/gravity variation\nmAccel=time*(mGravBase+mGravVar);\nX=value[0];\nY=value[1]+Math.pow(mAccel,2);\n[X,Y]<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u81ea\u7531\u843d\u4e0b\u306e\u516c\u5f0f\u306f\u300cv=gt\u3001y=(1\/2)gt^2\u300d\u306b\u57fa\u3065\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">random(-1,1)\u306a\u3069\u306e\u30e9\u30f3\u30c0\u30e0\u306a\u5024\u3092\u52a0\u3048\u308b\u3068\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3054\u3068\u306e\u52d5\u304d\u306b\u3070\u3089\u3064\u304d\u3092\u51fa\u305b\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u30b9\u30af\u30ea\u30d7\u30c8\u306b\u3057\u305f\u5834\u5408<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u9069\u7528\u3057\u305f\u3044\u30ec\u30a4\u30e4\u30fc\u306e\u300c\u4f4d\u7f6e\u300d\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u9078\u629e\u3057\u305f\u72b6\u614b\u3067\u30b9\u30af\u30ea\u30d7\u30c8\u3092\u5b9f\u884c\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-plain\"><code>props = app.project.activeItem.selectedProperties;\nfor (var i = 0; i &lt; props.length; i++){\n  if (props[i].canSetExpression){\n    props[i].expression = &quot;seedRandom(index,true); mGravBase=9.81;mGravVar=random(-1,1); mAccel=time*(mGravBase+mGravVar); X=value[0]; Y=value[1]+Math.pow(mAccel,2); [X,Y]&quot;;\n  }\n}<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">After Effects\u306e\u307b\u304b\u306e\u64cd\u4f5c\u306f\u3001\u307e\u3068\u3081\u304b\u3089\u3054\u89a7\u3044\u305f\u3060\u3051\u307e\u3059\u3002<\/p>\n\n\n<div class=\"swell-block-postLink\">\t\t\t<div class=\"p-blogCard -internal\" data-type=\"type1\" data-onclick=\"clickLink\">\n\t\t\t\t<div class=\"p-blogCard__inner\">\n\t\t\t\t\t<span class=\"p-blogCard__caption\">\u3042\u308f\u305b\u3066\u8aad\u307f\u305f\u3044<\/span>\n\t\t\t\t\t<div class=\"p-blogCard__thumb c-postThumb\"><figure class=\"c-postThumb__figure\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/cg-method.com\/after-effects\/wp-content\/uploads\/2026\/09\/after-effects-matome-3-300x169.jpg\" alt=\"\" class=\"c-postThumb__img u-obf-cover\" width=\"320\" height=\"180\"><\/figure><\/div>\t\t\t\t\t<div class=\"p-blogCard__body\">\n\t\t\t\t\t\t<a class=\"p-blogCard__title\" href=\"https:\/\/cg-method.com\/after-effects\/after-effects-matome\/\">After Effects\u306e\u4f7f\u3044\u65b9\u307e\u3068\u3081\uff5c\u30a8\u30af\u30b9\u30d7\u30ec\u30c3\u30b7\u30e7\u30f3\u30fb\u66f8\u304d\u51fa\u3057\u30fb\u30d7\u30e9\u30b0\u30a4\u30f3<\/a>\n\t\t\t\t\t\t<span class=\"p-blogCard__excerpt\">After Effects\u306e\u8a18\u4e8b\u3092\u3001\u76ee\u7684\u5225\u306b\u307e\u3068\u3081\u307e\u3057\u305f\u3002 \u66f8\u304d\u51fa\u3057\u306e\u30c8\u30e9\u30d6\u30eb\u3084\u30a8\u30af\u30b9\u30d7\u30ec\u30c3\u30b7\u30e7\u30f3\u306e\u8a18\u8ff0\u65b9\u6cd5\u306a\u3069\u3001\u5177\u4f53\u7684\u306a\u4f5c\u696d\u5834\u9762\u304b\u3089\u95a2\u9023\u8a18\u4e8b\u3092\u63a2\u305b\u307e\u3059\u3002 \u5404\u30ab\u30c6\u30b4\u30ea\u30fc\u306f\u95b2&#8230;<\/span>\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t<\/div>\n\n<!-- cgm-topic:start -->\n\n\n<p class=\"wp-block-paragraph\">\u30e9\u30f3\u30c0\u30e0\u306a\u52d5\u304d\u3092\u4f5c\u308b\u30a8\u30af\u30b9\u30d7\u30ec\u30c3\u30b7\u30e7\u30f3\u306f\u3001\u307b\u304b\u306b\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n<div class=\"swell-block-postLink\">\t\t\t<div class=\"p-blogCard -internal\" data-type=\"type1\" data-onclick=\"clickLink\">\n\t\t\t\t<div class=\"p-blogCard__inner\">\n\t\t\t\t\t<span class=\"p-blogCard__caption\">\u3042\u308f\u305b\u3066\u8aad\u307f\u305f\u3044<\/span>\n\t\t\t\t\t<div class=\"p-blogCard__thumb c-postThumb\"><figure class=\"c-postThumb__figure\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/cg-method.com\/after-effects\/wp-content\/uploads\/2026\/01\/after-effects-wiggle-loop-expression-300x169.jpg\" alt=\"\" class=\"c-postThumb__img u-obf-cover\" width=\"320\" height=\"180\"><\/figure><\/div>\t\t\t\t\t<div class=\"p-blogCard__body\">\n\t\t\t\t\t\t<a class=\"p-blogCard__title\" href=\"https:\/\/cg-method.com\/after-effects\/after-effects-wiggle-loop-expression\/\">After Effects\u2502\u30a6\u30a3\u30b0\u30eb\u3092\u30eb\u30fc\u30d7\u3055\u305b\u308b\u30a8\u30af\u30b9\u30d7\u30ec\u30c3\u30b7\u30e7\u30f3<\/a>\n\t\t\t\t\t\t<span class=\"p-blogCard__excerpt\">After Effects\u306e\u30a6\u30a3\u30b0\u30eb\uff08wiggle\uff09\u3067\u30e9\u30f3\u30c0\u30e0\u306b\u63fa\u3089\u3057\u306a\u304c\u3089\u3001\u304d\u308c\u3044\u306b\u30eb\u30fc\u30d7\u518d\u751f\u3055\u305b\u308b\u65b9\u6cd5\u3067\u3059\u3002 \u30a8\u30af\u30b9\u30d7\u30ec\u30c3\u30b7\u30e7\u30f3\u3067\u30e9\u30f3\u30c0\u30e0\u306a\u52d5\u304d\u3092\u4ed8\u3051\u3064\u3064\u3001\u5468\u671f\u7684\u306b\u30eb\u30fc\u30d7\u3055&#8230;<\/span>\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t<\/div>\n\n<div class=\"swell-block-postLink\">\t\t\t<div class=\"p-blogCard -internal\" data-type=\"type1\" data-onclick=\"clickLink\">\n\t\t\t\t<div class=\"p-blogCard__inner\">\n\t\t\t\t\t<span class=\"p-blogCard__caption\">\u3042\u308f\u305b\u3066\u8aad\u307f\u305f\u3044<\/span>\n\t\t\t\t\t<div class=\"p-blogCard__thumb c-postThumb\"><figure class=\"c-postThumb__figure\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/cg-method.com\/after-effects\/wp-content\/uploads\/2026\/01\/after-effects-fixed-random-value-expression-300x169.jpg\" alt=\"\" class=\"c-postThumb__img u-obf-cover\" width=\"320\" height=\"180\"><\/figure><\/div>\t\t\t\t\t<div class=\"p-blogCard__body\">\n\t\t\t\t\t\t<a class=\"p-blogCard__title\" href=\"https:\/\/cg-method.com\/after-effects\/after-effects-fixed-random-value-expression\/\">After Effects\u2502\u7279\u5b9a\u306e\u30e9\u30f3\u30c0\u30e0\u5024\u306e\u307e\u307e\u56fa\u5b9a\u3059\u308b\u30a8\u30af\u30b9\u30d7\u30ec\u30c3\u30b7\u30e7\u30f3<\/a>\n\t\t\t\t\t\t<span class=\"p-blogCard__excerpt\">\u30e9\u30f3\u30c0\u30e0\u5024\u3092\u56fa\u5b9a\u3057\u305f\u307e\u307e\u4f7f\u3044\u305f\u3044\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002 \u30ec\u30a4\u30e4\u30fc\u3092\u30e9\u30f3\u30c0\u30e0\u306b\u56de\u8ee2\u3055\u305b\u305f\u3044\u3082\u306e\u306e\u3001\u30d5\u30ec\u30fc\u30e0\u5358\u4f4d\u3067\u5909\u5316\u3055\u305b\u305a\u306b\u56fa\u5b9a\u3057\u305f\u3044\u3068\u304d\u306b\u4f7f\u3048\u308b\u30a8\u30af\u30b9\u30d7\u30ec\u30c3\u30b7\u30e7\u30f3\u3067&#8230;<\/span>\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t<\/div>\n\n<div class=\"swell-block-postLink\">\t\t\t<div class=\"p-blogCard -internal\" data-type=\"type1\" data-onclick=\"clickLink\">\n\t\t\t\t<div class=\"p-blogCard__inner\">\n\t\t\t\t\t<span class=\"p-blogCard__caption\">\u3042\u308f\u305b\u3066\u8aad\u307f\u305f\u3044<\/span>\n\t\t\t\t\t<div class=\"p-blogCard__thumb c-postThumb\"><figure class=\"c-postThumb__figure\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/cg-method.com\/after-effects\/wp-content\/uploads\/2026\/01\/after-effects-random-z-position-expression-300x169.jpg\" alt=\"\" class=\"c-postThumb__img u-obf-cover\" width=\"320\" height=\"180\"><\/figure><\/div>\t\t\t\t\t<div class=\"p-blogCard__body\">\n\t\t\t\t\t\t<a class=\"p-blogCard__title\" href=\"https:\/\/cg-method.com\/after-effects\/after-effects-random-z-position-expression\/\">After Effects\u2502Z\u65b9\u5411\u3060\u3051\u3092\u30e9\u30f3\u30c0\u30e0\u306e\u5024\u3092\u5165\u308c\u308b\u30a8\u30af\u30b9\u30d7\u30ec\u30c3\u30b7\u30e7\u30f3<\/a>\n\t\t\t\t\t\t<span class=\"p-blogCard__excerpt\">\u753b\u50cf\u3092Z\u65b9\u5411\u306b\u30e9\u30f3\u30c0\u30e0\u3067\u914d\u7f6e\u3057\u305f\u3044\u3002 \u591a\u6570\u306e\u753b\u50cf\u3092\u5965\u884c\u304d\u65b9\u5411\u306b\u9069\u5ea6\u306b\u5206\u6563\u3057\u3066\u914d\u7f6e\u3059\u308b\u305f\u3081\u3001Z\u65b9\u5411\u306e\u307f\u306b\u30e9\u30f3\u30c0\u30e0\u306a\u5024\u3092\u9069\u7528\u3059\u308b\u30a8\u30af\u30b9\u30d7\u30ec\u30c3\u30b7\u30e7\u30f3\u3092\u4f5c\u6210\u3057\u307e\u3057\u305f\u3002 &#8230;<\/span>\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t<\/div>\n\n<!-- cgm-topic:end -->\n\n\n","protected":false},"excerpt":{"rendered":"<p>After Effects\u3067\u91cd\u529b\u306b\u3088\u308b\u843d\u4e0b\u904b\u52d5\u3092\u8868\u73fe\u3059\u308b\u65b9\u6cd5\u3092\u307e\u3068\u3081\u307e\u3057\u305f\u3002 \u30ad\u30fc\u30d5\u30ec\u30fc\u30e0\u3092\u624b\u4f5c\u696d\u3067\u6253\u3064\u4ee3\u308f\u308a\u306b\u30a8\u30af\u30b9\u30d7\u30ec\u30c3\u30b7\u30e7\u30f3\u3092\u6d3b\u7528\u3059\u308b\u3068\u3001\u52b9\u7387\u3088\u304f\u81ea\u7136\u306a\u843d\u4e0b\u3092\u518d\u73fe\u3067\u304d\u307e\u3059\u3002 \u91cd\u529b\u306e\u30a8\u30af\u30b9\u30d7\u30ec\u30c3\u30b7\u30e7\u30f3 \u81ea\u7531\u843d\u4e0b\u306e\u516c\u5f0f [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":17945,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"pochipp_cv_data":"","swell_btn_cv_data":"","ssp_meta_description":"After Effects\u3067\u81ea\u7136\u306a\u843d\u4e0b\u904b\u52d5\u3092\u8868\u73fe\u3059\u308b\u30a8\u30af\u30b9\u30d7\u30ec\u30c3\u30b7\u30e7\u30f3\u306e\u30b3\u30fc\u30c9\u3092\u63b2\u8f09\u3002\u624b\u4f5c\u696d\u3067\u30ad\u30fc\u30d5\u30ec\u30fc\u30e0\u3092\u6253\u305f\u305a\u306b\u81ea\u7531\u843d\u4e0b\u306e\u516c\u5f0f\u306b\u57fa\u3065\u3044\u305f\u52d5\u304d\u3092\u4f5c\u308b\u30b3\u30fc\u30c9\u3068\u3001\u4f4d\u7f6e\u30d7\u30ed\u30d1\u30c6\u30a3\u306b\u4e00\u62ec\u9069\u7528\u3067\u304d\u308b\u30b9\u30af\u30ea\u30d7\u30c8\u306e\u66f8\u304d\u65b9\u304c\u8aad\u3081\u307e\u3059\u3002","ssp_meta_title":"\u30a8\u30af\u30b9\u30d7\u30ec\u30c3\u30b7\u30e7\u30f3\u3067\u91cd\u529b\u3092\u8868\u73fe\u3059\u308b\u65b9\u6cd5","ssp_meta_robots":"","ssp_meta_canonical":"","ssp_meta_image":"","ssp_meta_keyword":"","book_review_data":"","footnotes":""},"categories":[28],"tags":[],"class_list":["post-17757","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-expression-script"],"_links":{"self":[{"href":"https:\/\/cg-method.com\/after-effects\/wp-json\/wp\/v2\/posts\/17757","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cg-method.com\/after-effects\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cg-method.com\/after-effects\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cg-method.com\/after-effects\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/cg-method.com\/after-effects\/wp-json\/wp\/v2\/comments?post=17757"}],"version-history":[{"count":6,"href":"https:\/\/cg-method.com\/after-effects\/wp-json\/wp\/v2\/posts\/17757\/revisions"}],"predecessor-version":[{"id":18575,"href":"https:\/\/cg-method.com\/after-effects\/wp-json\/wp\/v2\/posts\/17757\/revisions\/18575"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cg-method.com\/after-effects\/wp-json\/wp\/v2\/media\/17945"}],"wp:attachment":[{"href":"https:\/\/cg-method.com\/after-effects\/wp-json\/wp\/v2\/media?parent=17757"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cg-method.com\/after-effects\/wp-json\/wp\/v2\/categories?post=17757"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cg-method.com\/after-effects\/wp-json\/wp\/v2\/tags?post=17757"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}